Heat oven to 350
degrees.Beat butter and powdered sugar
until fluffy.Add flour, cocoa and vanilla.Divide dough in half.Form each half into a roll and flatten sides
to form a long triangular roll.Refrigerate until ready to bake.Cut into 3/8 inch slices and bake on ungreased cookie sheets for 10-13
minutes or until firm to the touch.

Melt vanilla chips and
shortening in microwave on medium heat until soft.Stir and continue to melt until smooth.Drizzle over triangles.While wet sprinkle with green sugar.